Stabilizers of the Max homodimer identified in virtual ligand screening inhibit Myc function.

Abstract:

:Many human cancers show constitutive or amplified expression of the transcriptional regulator and oncoprotein Myc, making Myc a potential target for therapeutic intervention. Here we report the down-regulation of Myc activity by reducing the availability of Max, the essential dimerization partner of Myc. Max is expressed constitutively and can form unstable homodimers. We have isolated stabilizers of the Max homodimer by applying virtual ligand screening (VLS) to identify specific binding pockets for small molecule interactors. Candidate compounds found by VLS were screened by fluorescence resonance energy transfer, and from these screens emerged a potent, specific stabilizer of the Max homodimer. In vitro binding assays demonstrated that the stabilizer enhances the formation of the Max-Max homodimer and interferes with the heterodimerization of Myc and Max in a dose-dependent manner. Furthermore, this compound interferes with Myc-induced oncogenic transformation, Myc-dependent cell growth, and Myc-mediated transcriptional activation. The Max-Max stabilizer can be considered a lead compound for the development of inhibitors of the Myc network.

journal_name

Mol Pharmacol

journal_title

Molecular pharmacology

authors

Jiang H,Bower KE,Beuscher AE 4th,Zhou B,Bobkov AA,Olson AJ,Vogt PK

doi

10.1124/mol.109.054858

subject

Has Abstract

pub_date

2009-09-01 00:00:00

pages

491-502

issue

3

eissn

0026-895X

issn

1521-0111

pii

mol.109.054858

journal_volume

76

pub_type

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